A beekeeper (or apiarist) keeps bees in order to collect their honey and other products that the hive produces (including beeswax, propolis, pollen, and royal jelly), to pollinate crops, or to produce bees for sale to other beekeepers. A location where bees are kept is called an apiary or "bee yard". Depictions of humans collecting honey from wild bees date to 15,000 years ago, efforts to domesticate them are shown in Egyptian art around 4,500 years ago.